Merge branch 'ps/build-hotfix'

A topic to optionally build with meson, which has graduated to
'master' recently, has regressed the normal Makefile build, which
is being corrected.

* ps/build-hotfix:
  meson: add options to override build information
  GIT-VERSION-GEN: fix overriding GIT_BUILT_FROM_COMMIT and GIT_DATE
  GIT-VERSION-GEN: fix overriding GIT_VERSION
  Makefile: introduce template for GIT-VERSION-GEN
  Makefile: drop unneeded indirection for GIT-VERSION-GEN outputs
  Makefile: stop including "GIT-VERSION-FILE" in docs

diff --cc GIT-VERSION-GEN
Simple merge

diff --cc Makefile
Simple merge

diff --cc meson.build
Simple merge

diff --cc meson_options.txt
Simple merge